Rupp got silver in a event lagat wasn't in.....
The 1972 and 1976 Olympics were run faster
Lagat has also ran Faster than 1258
All of your counter arguments supporting Rupp are valid for lagat.
except of course, how fast has Rupp run the 1500?
If Lagat had some awesome "thyroid condition" their would be a new sheriff in town and it would be Lagat winning the 1500,the 3000m steeple, the 5k and the 10k and jogging to 3rd in the marathon after he won the Triathlon